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Michael Natterer authored
...PNG Description encoding error. Don't unconditionally display all error messages from thumbnail saving. Instead, return the error from gimp_imagefile_create_thumbnai() and gimp_imagefile_save_thumbnail() and display it only if thumbnail creation was the actual user-intended action (like clicking the preview in a file dialog). Do not display the error when thumbnailing is just a side effect of loading/saving an image.
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